Top definition
The accidental creation of a pun in the midst of an attempt at the literal conveyance of linguistic meaning.
Ex. You know its happened when you here the caveat "no pun intended"

My exclamation when a baseball player for the Boston Red Sox made a brutal error against the Kansas city royals,

"That was a royal f*-#up" my friend "that was a stumbleupun"

A sign on the lawn at a drug rehab center said: “Keep off the Grass.” Upon driving away I thiught, "that was a stumbleupun"
by Samuel1089 August 08, 2013
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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